Hello everyone : The nodetool tablehistograms have one argument which you can fill with only one table name with the format "keyspace_name.table_name /keyspace_name table_name", so that you can get the table histograms of the specied table.
And if none arguments is set, all the tables' histograms will be print out.And if more than 2 arguments (nomatter the format is right or wrong) are set , all the tables' histograms will also be print out too(Which is a bug In my mind). So the usage of nodetool tablehistograms has some usage restrictions, That is either output one , or all informations. As CASSANDRA-18296 <https://issues.apache.org/jira/browse/CASSANDRA-18296> described , I will change the usage of nodetool tablehistograms, which support the feature below: 1. nodetool tablehistograms ks.tb1 ks.tb2 .... //print out list of tables' histograms with format keyspace.table 2.nodetool tablehistograms ks1 ks2 ks3 ... //print out list of keyspaces histograms 3.nodetool tablehistograms -i ks1 ks2 .... //print out list of table histograms except for the keyspaces list behind the option -i 4.nodetool tablehistograns -i ks ks.tb // print out list tables' histograms except for table in keyspace ks and ks.tb table. 5.none option specified ,then all tables histograms will be print out. The usage will breaks compatibility with how it was done previously, and as this is a user facing tool. So, What do you think? Thanks~~~
